355 vs 304 high rpm?

[afstruct]

Sorry to go off topic sort of. I'm looking at a set of heads off a vs clubsport. Now if they are factory 304. Did hsv do anything different to the heads? I have a vs ss series 1 and the guy said he had crank Un confirmed 355. But I'm keen on the heads if there is that slight gain

As said before , heads the same until VT and/or VS series iii

Difference between Holden/Hsv for VS= not including ( GTS /215i Senator ) , was Exhaust, knock sensor, memcal,( tune) and CAI like in photo.

 

[elyocttamvsss]

As said before , heads the same until VT and/or VS series iii

Difference between Holden/Hsv for VS= not including ( GTS /215i Senator ) , was Exhaust, knock sensor, memcal,( tune) and CAI like in photo.

Thank you mate.